package com.zxing.util;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.util.Log;
import android.util.TypedValue;
import android.view.KeyEvent;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.extrace.ui.main.R;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.Result;
import com.google.zxing.ResultPoint;
import com.google.zxing.client.result.ParsedResult;
import com.google.zxing.client.result.ResultParser;
import com.zxing.util.camera.CameraManager;

import java.io.IOException;
import java.util.Collection;
import java.util.Map;



/**
 * This activity opens the camera and does the actual scanning on a background
 * thread. It draws a viewfinder to help the user place the barcode correctly,
 * shows feedback as the image processing is happening, and then overlays the
 * results when a scan is successful.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 */
public final class CaptureActivity extends Activity implements
        SurfaceHolder.Callback {

    private static final String TAG = CaptureActivity.class.getSimpleName();

//	private static final long DEFAULT_INTENT_RESULT_DURATION_MS = 1500L;
//	private static final long BULK_MODE_SCAN_DELAY_MS = 1000L;

    private CameraManager cameraManager;
    private CaptureActivityHandler handler;
    private ViewfinderView viewfinderView;
    private TextView statusView;
    private View resultView;
    private String lastResult;
    private boolean hasSurface;
    private Collection<BarcodeFormat> decodeFormats;
    private Map<DecodeHintType, ?> decodeHints;
    private String characterSet;
    private InactivityTimer inactivityTimer;
    private BeepManager beepManager;
    private AmbientLightManager ambientLightManager;
    private boolean return_press;

    ViewfinderView getViewfinderView() {
        return viewfinderView;
    }

    public Handler getHandler() {
        return handler;
    }

    CameraManager getCameraManager() {
        return cameraManager;
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.capture);

        hasSurface = false;
        // historyManager = new HistoryManager(this);
        // historyManager.trimHistory();
        inactivityTimer = new InactivityTimer(this);
        beepManager = new BeepManager(this);
        ambientLightManager = new AmbientLightManager(this);

        PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
    }

    @Override
    protected void onResume() {
        super.onResume();

        // CameraManager must be initialized here, not in onCreate(). This is
        // necessary because we don't
        // want to open the camera driver and measure the screen size if we're
        // going to show the help on
        // first launch. That led to bugs where the scanning rectangle was the
        // wrong size and partially
        // off screen.
        cameraManager = new CameraManager(getApplication());

        viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
        viewfinderView.setCameraManager(cameraManager);

        resultView = findViewById(R.id.result_view);
        statusView = (TextView) findViewById(R.id.status_view);

        handler = null;
//		lastResult = null;

        SharedPreferences prefs = PreferenceManager
                .getDefaultSharedPreferences(this);

        if (prefs.getBoolean(PreferencesActivity.KEY_DISABLE_AUTO_ORIENTATION,
                true)) {
            setRequestedOrientation(getCurrentOrientation());
        } else {
            // setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);
        }

        resetStatusView();

        SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        if (hasSurface) {
            // The activity was paused but not stopped, so the surface still
            // exists. Therefore
            // surfaceCreated() won't be called, so init the camera here.
            initCamera(surfaceHolder);
        } else {
            // Install the callback and wait for surfaceCreated() to init the
            // camera.
            surfaceHolder.addCallback(this);
        }

        beepManager.updatePrefs();
        ambientLightManager.start(cameraManager);

        inactivityTimer.onResume();

        Intent intent = getIntent();

        decodeFormats = null;
        characterSet = null;

        if (intent != null) {

            //String action = intent.getAction();
            //String dataString = intent.getDataString();
            //characterSet = intent.getStringExtra(Intents.Scan.CHARACTER_SET);

        }
        return_press = false;
    }

    private int getCurrentOrientation() {
        int rotation = getWindowManager().getDefaultDisplay().getRotation();
        switch (rotation) {
            case Surface.ROTATION_0:
                return ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT;
            case Surface.ROTATION_90:
                return ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
            default:
                return ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
        }
    }

    @Override
    protected void onPause() {
        if (handler != null) {
            handler.quitSynchronously();
            handler = null;
        }
        inactivityTimer.onPause();
        ambientLightManager.stop();
        cameraManager.closeDriver();
        if (!hasSurface) {
            SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
            SurfaceHolder surfaceHolder = surfaceView.getHolder();
            surfaceHolder.removeCallback(this);
        }
        super.onPause();
    }

    @Override
    protected void onDestroy() {
        inactivityTimer.shutdown();
        super.onDestroy();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_BACK:
                Intent intent = new Intent();
                if (lastResult != null) {
                    intent.putExtra("BarCode",lastResult);
                    setResult(RESULT_OK,intent);
                    finish();
                    return true;
                }
                else
                {
                    if(return_press){
                        setResult(RESULT_CANCELED,intent);
                        finish();
                        return true;
                    }
                    else{
                        Toast.makeText(this, "再按一次退出!", Toast.LENGTH_SHORT).show();
                        return_press = true;
                    }
                    restartPreviewAfterDelay(0L);
                    return true;
                }
            case KeyEvent.KEYCODE_FOCUS:
            case KeyEvent.KEYCODE_CAMERA:
                // Handle these events so they don't launch the Camera app
                return true;
            // Use volume up/down to turn on light
            case KeyEvent.KEYCODE_VOLUME_DOWN:
                cameraManager.setTorch(false);
                return true;
            case KeyEvent.KEYCODE_VOLUME_UP:
                cameraManager.setTorch(true);
                return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if (holder == null) {
            Log.e(TAG,
                    "*** WARNING *** surfaceCreated() gave us a null surface!");
        }
        if (!hasSurface) {
            hasSurface = true;
            initCamera(holder);
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        hasSurface = false;
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
                               int height) {

    }

    /**
     * A valid barcode has been found, so give an indication of success and show
     * the results.
     *
     * @param rawResult
     *            The contents of the barcode.
     * @param scaleFactor
     *            amount by which thumbnail was scaled
     * @param barcode
     *            A greyscale bitmap of the camera data which was decoded.
     */
    public void handleDecode(Result rawResult, Bitmap barcode, float scaleFactor) {
        inactivityTimer.onActivity();
        //lastResult = rawResult;

        beepManager.playBeepSoundAndVibrate();
        drawResultPoints(barcode, scaleFactor, rawResult);

        statusView.setVisibility(View.GONE);
        viewfinderView.setVisibility(View.GONE);
        resultView.setVisibility(View.VISIBLE);

        ImageView barcodeImageView = (ImageView) findViewById(R.id.barcode_image_view);
        if (barcode == null) {
            barcodeImageView.setImageBitmap(BitmapFactory.decodeResource(
                    getResources(), R.drawable.launcher_icon));
        } else {
            barcodeImageView.setImageBitmap(barcode);
        }

        ParsedResult result = ResultParser.parseResult(rawResult);
        String contents = result.getDisplayResult().replace("\r", "");
        CharSequence displayContents = contents;
        lastResult = contents;
        TextView contentsTextView = (TextView) findViewById(R.id.contents_text_view);
        contentsTextView.setText(displayContents);
        int scaledSize = Math.max(22, 32 - displayContents.length() / 4);
        contentsTextView.setTextSize(TypedValue.COMPLEX_UNIT_SP, scaledSize);
    }

    /**
     * Superimpose a line for 1D or dots for 2D to highlight the key features of
     * the barcode.
     *
     * @param barcode
     *            A bitmap of the captured image.
     * @param scaleFactor
     *            amount by which thumbnail was scaled
     * @param rawResult
     *            The decoded results which contains the points to draw.
     */
    private void drawResultPoints(Bitmap barcode, float scaleFactor,
                                  Result rawResult) {
        ResultPoint[] points = rawResult.getResultPoints();
        if (points != null && points.length > 0) {
            Canvas canvas = new Canvas(barcode);
            Paint paint = new Paint();
            paint.setColor(getResources().getColor(R.color.result_points));
            if (points.length == 2) {
                paint.setStrokeWidth(4.0f);
                drawLine(canvas, paint, points[0], points[1], scaleFactor);
            } else if (points.length == 4
                    && (rawResult.getBarcodeFormat() == BarcodeFormat.UPC_A || rawResult
                    .getBarcodeFormat() == BarcodeFormat.EAN_13)) {
                // Hacky special case -- draw two lines, for the barcode and
                // metadata
                drawLine(canvas, paint, points[0], points[1], scaleFactor);
                drawLine(canvas, paint, points[2], points[3], scaleFactor);
            } else {
                paint.setStrokeWidth(10.0f);
                for (ResultPoint point : points) {
                    if (point != null) {
                        canvas.drawPoint(scaleFactor * point.getX(),
                                scaleFactor * point.getY(), paint);
                    }
                }
            }
        }
    }

    private static void drawLine(Canvas canvas, Paint paint, ResultPoint a,
                                 ResultPoint b, float scaleFactor) {
        if (a != null && b != null) {
            canvas.drawLine(scaleFactor * a.getX(), scaleFactor * a.getY(),
                    scaleFactor * b.getX(), scaleFactor * b.getY(), paint);
        }
    }

    private void initCamera(SurfaceHolder surfaceHolder) {
        if (surfaceHolder == null) {
            throw new IllegalStateException("No SurfaceHolder provided");
        }
        if (cameraManager.isOpen()) {
            Log.w(TAG, "initCamera() while already open -- late SurfaceView callback?");
            return;
        }
        try {
            cameraManager.openDriver(surfaceHolder);
            // Creating the handler starts the preview, which can also throw a
            // RuntimeException.
            if (handler == null) {
                handler = new CaptureActivityHandler(this, decodeFormats,
                        decodeHints, characterSet, cameraManager);
            }
//			decodeOrStoreSavedBitmap(null, null);
        } catch (IOException ioe) {
            Log.w(TAG, ioe);
            displayFrameworkBugMessageAndExit();
        } catch (RuntimeException e) {
            // Barcode Scanner has seen crashes in the wild of this variety:
            // java.?lang.?RuntimeException: Fail to connect to camera service
            Log.w(TAG, "Unexpected error initializing camera", e);
            displayFrameworkBugMessageAndExit();
        }
    }

    private void displayFrameworkBugMessageAndExit() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(getString(R.string.app_name));
        builder.setMessage(getString(R.string.msg_camera_framework_bug));
        builder.setPositiveButton(R.string.button_ok, new FinishListener(this));
        builder.setOnCancelListener(new FinishListener(this));
        builder.show();
    }

    public void restartPreviewAfterDelay(long delayMS) {
        if (handler != null) {
            handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS);
        }
        resetStatusView();
    }

    private void resetStatusView() {
        resultView.setVisibility(View.GONE);
        statusView.setText(R.string.msg_default_status);
        statusView.setVisibility(View.VISIBLE);
        viewfinderView.setVisibility(View.VISIBLE);
        lastResult = null;
    }

    public void drawViewfinder() {
        viewfinderView.drawViewfinder();
    }
}
